D. none of these
A train covers a distance of 12 km in 10 minutes. If it takes 6 seconds to pass a telegraph post, then the length of the train is
River is running at 3 kmph. It takes a man twice as long to row up as to row down the river. The rate of the main in still water is:
A watch gains 12 seconds every 3 hours, what time will it show at 10 A.M. on Tuesday if the watch is set right at 3 A.M. on Sunday?
The speed of the boat in still water in 12 kmph. It can travel downstream through 45 kms in 3 hrs. In what time would it cover the same distance upstream?
In a 100m race A cover the distance in 36 seconds and B in 45 seconds. In this race A beats B by